In garden peas, purple flowers (P) are dominant to white (p) flowers, and tall plants (T) are dominant to short plants (t). If a purple tall plant (PpTt) is crossed with a white short plant (pptt), what is the resulting phenotypic ratio?

A. 1:1:1:1 purple tall to purple short to white tall to white short,
B. 3:2 purple tall to purple short,
C. 9:3:3:1 purple tall to purple short to white tall to white short,
D. all purple tall.

A

Explanation:

As given;

Purple flower(P) is dominant over white (p) flower, so Pis dominant over p.

Tall plant (T) is dominant over short plant (t), so T is dominant over t.

Cross between purple tall plant (PpTt) and white short (pptt)

PpTt × pptt ; gametes are Parent-1: PT, Pt, pT, pp & parent-2: pt

Offspring are:  PpTt, Pptt, ppTt, pptt ( genotype)

Phenotype: PpTt = purple tall,

                    Pptt= purple short

                    ppTt= white tall

                   pptt= white short

So the ratio is 1:1:1:1 purple tall to purple short to white tall to white short.

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